Yuma County, Arizona
June 30, 2003
Yuma County Office
Insect Management: Witches'-broom disease has only been of minor importance in the Western United States, but has been found in some low desert alfalfa fields. The disease was long considered to be a leafhopper-transmitted virus, but now is known to be caused by a mycoplasmalike microorganism. A vector of alfalfa witches'-broom disease in the Western United States is a leafhopper, Scaphytopius acututs. Symptoms of the disease include excessive development of short, spindly shoots from the crown and axillary buds along the stem. Spraying to control the leafhopper vector of the disease is usually not effective.
Weed Control: Both southern and field sandbur are very
difficult to control once they are established and have more than 5 or
6 leaves. Preemergence herbicides work well on the seed but are ineffective
on plants that have overwintered. Poast and Select/Prism are also ineffective
on established sanbur.
10 Year Summary (June 17-June 30, 1994-2003):
Issued in furtherance of Cooperative Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, James A. Christenson, Director Cooperative Extension, College of Agriculture and Life Sciences, The University of Arizona.
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Information provided by:
Barry Tickes, firstname.lastname@example.org Extension Agent, Yuma County
Michael Ottman, email@example.com Agronomy Specialist
College of Agriculture, The University of Arizona.
Eric Natwick, firstname.lastname@example.org UCCE Imperial County - Farm Advisor
University of California, Davis, CA.
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